The backtrack compilation code in the Irregex package (aka IrRegular Expressions) before…
Priority LOW 37CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
The backtrack compilation code in the Irregex package (aka IrRegular Expressions) before 0.9.6 for Scheme allows remote attackers to cause a denial of service (memory consumption) via a crafted regular expression with a repeating pattern.
Why it matters now
EPSS 0.02422 84th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:irregex_project:irregex:*:*:*:*:*:*:*:* | up to 0.9.5 | Vulnerable | Irregex Project |
- cpe:2.3:a:irregex_project:irregex:*:*:*:*:*:*:*:* Versions up to 0.9.5 Vulnerable ·Irregex Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9954
- 2026-10-03 Alias added: GHSA-3p97-hgvq-jvxr
References
Sources
- CVE-2016-9954 · CVE Program
- CVE-2016-9954 · NVD
- FIRST EPSS
- GHSA-3p97-hgvq-jvxr · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9954 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences